add a benchmark test for stack size (#75039)

dev/benchmarks/macrobenchmarks/lib/common.dart

@@ -19,5 +19,8 @@ const String kImageFilteredTransformAnimationRouteName = '/imagefiltered_transfo
 const String kMultiWidgetConstructionRouteName = '/multi_widget_construction';
 const String kHeavyGridViewRouteName = '/heavy_gridview';
 const String kSimpleScrollRouteName = '/simple_scroll';
+const String kStackSizeRouteName = '/stack_size';
 
 const String kScrollableName = '/macrobenchmark_listview';
+
+const String kStackSizeKey = 'stack_size';

dev/benchmarks/macrobenchmarks/lib/main.dart

@@ -21,6 +21,7 @@ import 'src/picture_cache.dart';
 import 'src/post_backdrop_filter.dart';
 import 'src/simple_animation.dart';
 import 'src/simple_scroll.dart';
+import 'src/stack_size.dart';
 import 'src/text.dart';
 
 const String kMacrobenchmarks = 'Macrobenchmarks';
@@ -54,6 +55,7 @@ class MacrobenchmarksApp extends StatelessWidget {
         kMultiWidgetConstructionRouteName: (BuildContext context) => const MultiWidgetConstructTable(10, 20),
         kHeavyGridViewRouteName: (BuildContext context) => HeavyGridViewPage(),
         kSimpleScrollRouteName: (BuildContext context) => SimpleScroll(),
+        kStackSizeRouteName: (BuildContext context) => StackSizePage(),
       },
     );
   }
@@ -181,6 +183,13 @@ class HomePage extends StatelessWidget {
               Navigator.pushNamed(context, kLargeImageChangerRouteName);
             },
           ),
+          ElevatedButton(
+            key: const Key(kStackSizeRouteName),
+            child: const Text('Stack Size'),
+            onPressed: () {
+              Navigator.pushNamed(context, kStackSizeRouteName);
+            },
+          ),
         ],
       ),
     );

dev/benchmarks/macrobenchmarks/lib/src/stack_size.dart

@@ -0,0 +1,122 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:ffi' as ffi;
+import 'dart:io' as io;
+
+import 'package:flutter/material.dart';
+
+import '../common.dart';
+
+typedef GetStackPointerCallback = int Function();
+
+// c interop function:
+// void* mmap(void* addr, size_t len, int prot, int flags, int fd, off_t offset);
+typedef CMmap = ffi.Pointer<ffi.Void> Function(
+    ffi.Pointer<ffi.Void>, ffi.IntPtr, ffi.Int32, ffi.Int32, ffi.Int32, ffi.IntPtr);
+typedef DartMmap = ffi.Pointer<ffi.Void> Function(
+    ffi.Pointer<ffi.Void>, int, int, int, int, int);
+final DartMmap mmap = ffi.DynamicLibrary.process().lookupFunction<CMmap, DartMmap>('mmap');
+
+// c interop function:
+// int mprotect(void* addr, size_t len, int prot);
+typedef CMprotect = ffi.Int32 Function(ffi.Pointer<ffi.Void>, ffi.IntPtr, ffi.Int32);
+typedef DartMprotect = int Function(ffi.Pointer<ffi.Void>, int, int);
+final DartMprotect mprotect = ffi.DynamicLibrary.process()
+    .lookupFunction<CMprotect, DartMprotect>('mprotect');
+
+const int kProtRead = 1;
+const int kProtWrite = 2;
+const int kProtExec = 4;
+
+const int kMapPrivate = 0x02;
+const int kMapJit = 0x0;
+const int kMapAnon = 0x20;
+
+const int kMemorySize = 16;
+const int kInvalidFileDescriptor = -1;
+const int kkFileMappingOffset = 0;
+
+const int kMemoryStartingIndex = 0;
+
+const int kExitCodeSuccess = 0;
+
+final GetStackPointerCallback getStackPointer = () {
+  // Makes sure we are running on an Android arm64 device.
+  if (!io.Platform.isAndroid)
+    throw 'This benchmark test can only be run on Android arm64 devices.';
+  final io.ProcessResult result = io.Process.runSync('getprop', <String>['ro.product.cpu.abi']);
+  if (result.exitCode != 0)
+    throw 'Failed to retrieve CPU information.';
+  if (!result.stdout.toString().contains('arm64'))
+    throw 'This benchmark test can only be run on Android arm64 devices.';
+
+  // Creates a block of memory to store the assembly code.
+  final ffi.Pointer<ffi.Void> region = mmap(ffi.nullptr, kMemorySize, kProtRead | kProtWrite,
+      kMapPrivate | kMapAnon | kMapJit, kInvalidFileDescriptor, kkFileMappingOffset);
+  if (region == ffi.nullptr) {
+    throw 'Failed to acquire memory for the test.';
+  }
+
+  // Writes the assembly code into the memory block. This assembly code returns
+  // the memory address of the stack pointer.
+  region.cast<ffi.Uint8>().asTypedList(kMemorySize).setAll(
+    kMemoryStartingIndex,
+    <int>[
+      // "mov x0, sp"  in machine code: E0030091.
+      0xe0, 0x03, 0x00, 0x91,
+      // "ret"         in machine code: C0035FD6.
+      0xc0, 0x03, 0x5f, 0xd6
+    ]
+  );
+
+  // Makes sure the memory block is executable.
+  if (mprotect(region, kMemorySize, kProtRead | kProtExec) != kExitCodeSuccess) {
+    throw 'Failed to write executable code to the memory.';
+  }
+  return region
+      .cast<ffi.NativeFunction<ffi.IntPtr Function()>>()
+      .asFunction<int Function()>();
+}();
+
+class StackSizePage extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Material(
+      child: Column(
+        children: <Widget>[
+          Container(
+            width: 200,
+            height: 100,
+            child: ParentWidget(),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class ParentWidget extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    final int myStackSize = getStackPointer();
+    return ChildWidget(parentStackSize: myStackSize);
+  }
+}
+
+class ChildWidget extends StatelessWidget {
+  const ChildWidget({this.parentStackSize, Key key}) : super(key: key);
+  final int parentStackSize;
+
+  @override
+  Widget build(BuildContext context) {
+    final int myStackSize = getStackPointer();
+    // Captures the stack size difference between parent widget and child widget
+    // during the rendering pipeline, i.e. one layer of stateless widget.
+    return Text(
+      '${parentStackSize - myStackSize}',
+      key: const ValueKey<String>(kStackSizeKey),
+    );
+  }
+}

dev/benchmarks/macrobenchmarks/test_driver/stack_size_perf_test.dart

@@ -0,0 +1,39 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:convert' show JsonEncoder;
+
+import 'package:flutter_driver/flutter_driver.dart';
+import 'package:file/file.dart';
+import 'package:path/path.dart' as path;
+import 'package:test/test.dart' hide TypeMatcher, isInstanceOf;
+
+import 'package:macrobenchmarks/common.dart';
+
+import 'util.dart';
+
+const JsonEncoder _prettyEncoder = JsonEncoder.withIndent('  ');
+
+void main() {
+  test('stack_size', () async {
+    int stackSizeInBytes;
+    await runDriverTestForRoute(kStackSizeRouteName, (FlutterDriver driver) async {
+      final String stackSize = await driver.getText(find.byValueKey(kStackSizeKey));
+      expect(stackSize.isNotEmpty, isTrue);
+      stackSizeInBytes = int.parse(stackSize);
+    });
+
+    expect(stackSizeInBytes > 0, isTrue);
+
+    await fs.directory(testOutputsDirectory).create(recursive: true);
+    final File file = fs.file(path.join(testOutputsDirectory, 'stack_size.json'));
+    await file.writeAsString(_encodeJson(<String, dynamic>{
+      'stack_size': stackSizeInBytes,
+    }));
+  }, timeout: const Timeout(kTimeout));
+}
+
+String _encodeJson(Map<String, dynamic> jsonObject) {
+  return _prettyEncoder.convert(jsonObject);
+}

dev/benchmarks/macrobenchmarks/test_driver/util.dart

@@ -7,51 +7,64 @@ import 'package:test/test.dart' hide TypeMatcher, isInstanceOf;
 
 import 'package:macrobenchmarks/common.dart';
 
+const Duration kTimeout = Duration(seconds: 30);
+
+typedef DriverTestCallBack = Future<void> Function(FlutterDriver driver);
+
+Future<void> runDriverTestForRoute(String routeName, DriverTestCallBack body) async {
+  final FlutterDriver driver = await FlutterDriver.connect();
+
+  // The slight initial delay avoids starting the timing during a
+  // period of increased load on the device. Without this delay, the
+  // benchmark has greater noise.
+  // See: https://github.com/flutter/flutter/issues/19434
+  await Future<void>.delayed(const Duration(milliseconds: 250));
+
+  await driver.forceGC();
+
+  final SerializableFinder scrollable = find.byValueKey(kScrollableName);
+  expect(scrollable, isNotNull);
+  final SerializableFinder button = find.byValueKey(kStackSizeRouteName);
+  expect(button, isNotNull);
+  await driver.scrollUntilVisible(scrollable, button, dyScroll: -50.0);
+  await driver.tap(button);
+
+  await body(driver);
+
+  driver.close();
+}
+
 void macroPerfTest(
     String testName,
     String routeName,
     { Duration pageDelay,
       Duration duration = const Duration(seconds: 3),
-      Duration timeout = const Duration(seconds: 30),
+      Duration timeout = kTimeout,
       Future<void> driverOps(FlutterDriver driver),
       Future<void> setupOps(FlutterDriver driver),
     }) {
   test(testName, () async {
-    final FlutterDriver driver = await FlutterDriver.connect();
+    Timeline timeline;
+    await runDriverTestForRoute(routeName, (FlutterDriver driver) async {
+      if (pageDelay != null) {
+        // Wait for the page to load
+        await Future<void>.delayed(pageDelay);
+      }
 
-    // The slight initial delay avoids starting the timing during a
+      if (setupOps != null) {
-    // period of increased load on the device. Without this delay, the
-    // benchmark has greater noise.
-    // See: https://github.com/flutter/flutter/issues/19434
-    await Future<void>.delayed(const Duration(milliseconds: 250));
-
-    await driver.forceGC();
-
-    final SerializableFinder scrollable = find.byValueKey(kScrollableName);
-    expect(scrollable, isNotNull);
-    final SerializableFinder button = find.byValueKey(routeName);
-    expect(button, isNotNull);
-    await driver.scrollUntilVisible(scrollable, button, dyScroll: -50.0);
-    await driver.tap(button);
-
-    if (pageDelay != null) {
-      // Wait for the page to load
-      await Future<void>.delayed(pageDelay);
-    }
-
-    if (setupOps != null) {
       await setupOps(driver);
-    }
+      }
 
-    final Timeline timeline = await driver.traceAction(() async {
+      timeline = await driver.traceAction(() async {
       final Future<void> durationFuture = Future<void>.delayed(duration);
       if (driverOps != null) {
         await driverOps(driver);
       }
-      await durationFuture;
+        await durationFuture;
+      });
     });
 
-    driver.close();
+    expect(timeline, isNotNull);
 
     final TimelineSummary summary = TimelineSummary.summarize(timeline);
     await summary.writeSummaryToFile(testName, pretty: true);

dev/devicelab/bin/tasks/android_stack_size_test.dart

@@ -0,0 +1,12 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_devicelab/tasks/perf_tests.dart';
+import 'package:flutter_devicelab/framework/adb.dart';
+import 'package:flutter_devicelab/framework/framework.dart';
+
+Future<void> main() async {
+  deviceOperatingSystem = DeviceOperatingSystem.androidArm64;
+  await task(createStackSizeTest());
+}

dev/devicelab/lib/framework/adb.dart

@@ -52,7 +52,7 @@ String _findMatchId(List<String> idList, String idPattern) {
 DeviceDiscovery get devices => DeviceDiscovery();
 
 /// Device operating system the test is configured to test.
-enum DeviceOperatingSystem { android, ios, fuchsia, fake }
+enum DeviceOperatingSystem { android, androidArm64 ,ios, fuchsia, fake }
 
 /// Device OS to test on.
 DeviceOperatingSystem deviceOperatingSystem = DeviceOperatingSystem.android;
@@ -63,6 +63,8 @@ abstract class DeviceDiscovery {
     switch (deviceOperatingSystem) {
       case DeviceOperatingSystem.android:
         return AndroidDeviceDiscovery();
+      case DeviceOperatingSystem.androidArm64:
+        return AndroidDeviceDiscovery(cpu: _AndroidCPU.arm64);
       case DeviceOperatingSystem.ios:
         return IosDeviceDiscovery();
       case DeviceOperatingSystem.fuchsia:
@@ -155,12 +157,18 @@ abstract class Device {
   }
 }
 
+enum _AndroidCPU {
+  arm64,
+}
+
 class AndroidDeviceDiscovery implements DeviceDiscovery {
-  factory AndroidDeviceDiscovery() {
+  factory AndroidDeviceDiscovery({_AndroidCPU cpu}) {
-    return _instance ??= AndroidDeviceDiscovery._();
+    return _instance ??= AndroidDeviceDiscovery._(cpu);
   }
 
-  AndroidDeviceDiscovery._();
+  AndroidDeviceDiscovery._(this.cpu);
+
+  final _AndroidCPU cpu;
 
   // Parses information about a device. Example:
   //
@@ -185,6 +193,16 @@ class AndroidDeviceDiscovery implements DeviceDiscovery {
     return _workingDevice;
   }
 
+  Future<bool> _matchesCPURequirement(AndroidDevice device) async {
+    if (cpu == null)
+      return true;
+    switch (cpu) {
+      case _AndroidCPU.arm64:
+        return device.isArm64();
+    }
+    return true;
+  }
+
   /// Picks a random Android device out of connected devices and sets it as
   /// [workingDevice].
   @override
@@ -196,8 +214,22 @@ class AndroidDeviceDiscovery implements DeviceDiscovery {
     if (allDevices.isEmpty)
       throw const DeviceException('No Android devices detected');
 
-    // TODO(yjbanov): filter out and warn about those with low battery level
+    if (cpu != null) {
-    _workingDevice = allDevices[math.Random().nextInt(allDevices.length)];
+      for (final AndroidDevice device in allDevices) {
+        if (await _matchesCPURequirement(device)) {
+          _workingDevice = device;
+          break;
+        }
+      }
+
+    } else {
+      // TODO(yjbanov): filter out and warn about those with low battery level
+      _workingDevice = allDevices[math.Random().nextInt(allDevices.length)];
+    }
+
+    if (_workingDevice == null)
+      throw const DeviceException('Cannot find a suitable Android device');
+
     print('Device chosen: $_workingDevice');
   }
 
@@ -206,6 +238,11 @@ class AndroidDeviceDiscovery implements DeviceDiscovery {
     final String matchedId = _findMatchId(await discoverDevices(), deviceId);
     if (matchedId != null) {
       _workingDevice = AndroidDevice(deviceId: matchedId);
+      if (cpu != null) {
+        if (!await _matchesCPURequirement(_workingDevice)) {
+          throw DeviceException('The selected device $matchedId does not match the cpu requirement');
+        }
+      }
       print('Choose device by ID: $matchedId');
       return;
     }
@@ -444,6 +481,11 @@ class AndroidDevice extends Device {
     return wakefulness;
   }
 
+  Future<bool> isArm64() async {
+    final String cpuInfo = await shellEval('getprop', const <String>['ro.product.cpu.abi']);
+    return cpuInfo.contains('arm64');
+  }
+
   Future<void> _updateDeviceInfo() async {
     String info;
     try {

dev/devicelab/lib/tasks/perf_tests.dart

@@ -271,6 +271,43 @@ TaskFunction createTextfieldPerfE2ETest() {
   ).run;
 }
 
+TaskFunction createStackSizeTest() {
+  final String testDirectory =
+      '${flutterDirectory.path}/dev/benchmarks/macrobenchmarks';
+  const String testTarget = 'test_driver/run_app.dart';
+  const String testDriver = 'test_driver/stack_size_perf_test.dart';
+  return () {
+    return inDirectory<TaskResult>(testDirectory, () async {
+      final Device device = await devices.workingDevice;
+      await device.unlock();
+      final String deviceId = device.deviceId;
+      await flutter('packages', options: <String>['get']);
+
+      await flutter('drive', options: <String>[
+        '--no-android-gradle-daemon',
+        '-v',
+        '--verbose-system-logs',
+        '--profile',
+        '-t', testTarget,
+        '--driver', testDriver,
+        '-d',
+        deviceId,
+      ]);
+      final Map<String, dynamic> data = json.decode(
+        file('$testDirectory/build/stack_size.json').readAsStringSync(),
+      ) as Map<String, dynamic>;
+
+      final Map<String, dynamic> result = <String, dynamic>{
+        'stack_size_per_nesting_level': data['stack_size'],
+      };
+      return TaskResult.success(
+        result,
+        benchmarkScoreKeys: result.keys.toList(),
+      );
+    });
+  };
+}
+
 TaskFunction createFullscreenTextfieldPerfTest() {
   return PerfTest(
     '${flutterDirectory.path}/dev/benchmarks/macrobenchmarks',
@@ -466,6 +503,15 @@ class StartupTest {
           ]);
           applicationBinaryPath = '$testDirectory/build/app/outputs/flutter-apk/app-profile.apk';
           break;
+        case DeviceOperatingSystem.androidArm64:
+          await flutter('build', options: <String>[
+            'apk',
+            '-v',
+            '--profile',
+            '--target-platform=android-arm64',
+          ]);
+          applicationBinaryPath = '$testDirectory/build/app/outputs/flutter-apk/app-profile.apk';
+          break;
         case DeviceOperatingSystem.ios:
           await flutter('build', options: <String>[
             'ios',
@@ -998,6 +1044,20 @@ class CompileTest {
         if (reportPackageContentSizes)
           metrics.addAll(await getSizesFromApk(apkPath));
         break;
+      case DeviceOperatingSystem.androidArm64:
+        options.insert(0, 'apk');
+        options.add('--target-platform=android-arm64');
+        options.add('--tree-shake-icons');
+        options.add('--split-debug-info=infos/');
+        watch.start();
+        await flutter('build', options: options);
+        watch.stop();
+        final String apkPath = '$cwd/build/app/outputs/flutter-apk/app-release.apk';
+        final File apk = file(apkPath);
+        releaseSizeInBytes = apk.lengthSync();
+        if (reportPackageContentSizes)
+          metrics.addAll(await getSizesFromApk(apkPath));
+        break;
       case DeviceOperatingSystem.fuchsia:
         throw Exception('Unsupported option for Fuchsia devices');
       case DeviceOperatingSystem.fake:
@@ -1024,6 +1084,10 @@ class CompileTest {
         options.insert(0, 'apk');
         options.add('--target-platform=android-arm');
         break;
+      case DeviceOperatingSystem.androidArm64:
+        options.insert(0, 'apk');
+        options.add('--target-platform=android-arm64');
+        break;
       case DeviceOperatingSystem.fuchsia:
         throw Exception('Unsupported option for Fuchsia devices');
       case DeviceOperatingSystem.fake:

dev/devicelab/test/adb_test.dart

@@ -22,6 +22,18 @@ void main() {
     tearDown(() {
     });
 
+    group('cpu check', () {
+      test('arm64', () async {
+        FakeDevice.pretendArm64();
+        final AndroidDevice androidDevice = device as AndroidDevice;
+        expect(await androidDevice.isArm64(), isTrue);
+        expectLog(<CommandArgs>[
+          cmd(command: 'getprop', arguments: <String>['ro.bootimage.build.fingerprint', ';', 'getprop', 'ro.build.version.release', ';', 'getprop', 'ro.build.version.sdk'], environment: null),
+          cmd(command: 'getprop', arguments: <String>['ro.product.cpu.abi'], environment: null),
+        ]);
+      });
+    });
+
     group('isAwake/isAsleep', () {
       test('reads Awake', () async {
         FakeDevice.pretendAwake();
@@ -187,6 +199,12 @@ class FakeDevice extends AndroidDevice {
     ''';
   }
 
+  static void pretendArm64() {
+    output = '''
+      arm64
+    ''';
+  }
+
   @override
   Future<String> shellEval(String command, List<String> arguments, { Map<String, String> environment, bool silent = false }) async {
     commandLog.add(CommandArgs(